The ornamental design for a pig, as shown and described.
FIG. 1 is an isometric view of a top, front, and right side of an embodiment of a pig of the present invention;
FIG. 2 is a side elevational view of the right side of the pig of FIG. 1;
FIG. 3 is a side elevational view of a left side of the pig of FIG. 1;
FIG. 4 is a front elevational view of the pig of FIG. 1;
FIG. 5 is a rear elevational view of the pig of FIG. 1;
FIG. 6 is a top plan view of the pig of FIG. 1; and,
FIG. 7 is a bottom elevational view of the pig of FIG. 1.
The broken line showing of portions of a pig is included for the purpose of illustrating environmental structure and forms no part of the claimed design.